If, five years ago, my colleagues were told that they could work from home one day a week, they'd have been cock-a-hoop. These days, ask them come in any more than once a week and they act like you've asked them for the fucking moon and stars.
Call me old-fashioned, but I think my team work better in the office, collaboratively, with other teams, face to face. My boss agrees, but then adds that because her role is 'different', she's only coming in one day a week, but she supports me in my efforts to get people back into the office. From home.

Well that's fucking inspiring.
Ask HR for guidance (remotely, of course. They ain't coming in) and they simply state that they delegate it to the line managers to make that call, but repeat that management want people to be in the office 'the majority of the time'. That'll be me left holding that shitty stick then, trying to convince people to do something they don't want to do, at an additional cost and inconvenience, and basically saying, 'Well, why us and not everyone else?', for which I'm kinda stumped for any solid answer.